Influences of Leading-Edge Tubercle Amplitude on Airfoil Flow Field  

作　　者：ZHAO Ming WEI Tong ZHAO Yijia LIU Zhengxian 

机构地区：[1]Department of Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin,300350,China [2]Tianjin Key Laboratory of Modern Engineering Mechanics,Tianjin University,Tianjin,300350,China

出　　处：《Journal of Thermal Science》2023年第4期1335-1344,共10页热科学学报（英文版）

基　　金：This work was supported by the National Key R&D Program of China(Grant No.2022YFB2402801);the National Natural Science Foundation of China(Grant No.11972250 and 11672206);the Key Program of Tianjin Natural Science Foundation(Grant No.19JCZDJC32000);the Tianjin Natural Science Foundation(Grant No.20JCQNJC01950).

摘　　要：The influences of leading-edge tubercle amplitude on airfoil flow field have been analyzed at high angle of attack.The accuracy of a large eddy simulation(LES)research is validated through quantitative comparisons with corresponding experimental results.Then,a proper orthogonal decomposition(POD)analysis has been carried out based on the unsteady flow field and the fluid mechanisms of corresponding POD modes have been identified.Consequently,the influences of leading-edge tubercle amplitude have been uncovered.Since the streamwise vorticity is larger than that of small amplitude cases,the momentum transfer process at peaks is more obvious for large amplitude,leading to delayed flow separation.Both amplitude and wavelength play important roles in the generation of laminar separation bubble(LSB)at troughs.Moreover,the Karman vortex shedding process takes place at specific trough sections as pairs of periodic spatial structures exist in the dominant POD modes.The destruction of Karman vortex shedding process is strengthened along with the increase of amplitude.

关 键 词：leading-edge tubercle airfoil flow field proper orthogonal decomposition 

分 类 号：O35[理学—流体力学]